I live in a desert climate, and I frequently get exercise-induced asthma in the early summer when it's hot and dry. A useful metric is the dew point, for me ast

I live in a desert climate, and I frequently get exercise-induced asthma in the early summer when it's hot and dry. A useful metric is the dew point, for me asthma kicks in when the dew point approaches freezing. If you live in a more humid climate, warmer weather usually means higher dew points, so it's only dry in the winter when the air is too cold to hold the moisture (because dew point can't ever exceed temperature).